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参数资料
| 型号： | MCP1653ST-E/UN |
| 厂商： | Microchip Technology |
| 文件页数： | 16/28页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BST FLYBK CM 10MSOP |
| 标准包装： | 2,500 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 850kHz |
| 占空比： | 80% |
| 电源电压： | 2.7 V ~ 5.5 V |
| 降压： | 无 |
| 升压： | 是 |
| 回扫： | 是 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 包装： | 带卷 (TR) |
| 配用： | MCP1650EV-ND - BOARD EVAL FOR MCP1650,51,52,53 MCP1650DM-LED1-ND - BOARD DEMO FOR MCP165X |
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MCP1650/51/52/53
5.1.2
BOOTSTRAP BOOST
to start up with the input voltage below 2.7V. For this
APPLICATIONS
For bootstrap configurations, the higher-regulated
boost output voltage is used to power the MCP1650/
51/52/53. This provides a constant higher voltage used
to drive the external MOSFET. The R-option devices
(UVLO < 2.0V) can be used for applications that need
type of application, the MCP1650/51/52/53 will start off
of the lower 2.0V input and begin to boost the output up
to its regulated value. As the output rises, so does the
input voltage of the MCP1650/51/52/53. This provides
a solution for 2-cell alkaline inputs for output voltages
that are less than 6V.
Li-Ion Input to 5.0V 1A Regulated Output (Bootstrap) with MCP1652 Power Good Output
3.3 μH
Schottky Diode
Vout = 5V
Iout = 1A
10 ?
V IN
8
3
CS
2
4
7
Input
Voltage
2.8V to 4.2V
C in
47 μF
0.1 μF
o n
o ff
GND
S HDN
5
NC 6
MCP1652
1 EXT
FB
PG
N-Channel
MOSFET
3.09 k ?
C out
47 μF
Ceramic
0.1 ?
Shutdown
Power Good Output
1 k ?
FIGURE 5-2:
Bootstrap Application Circuit MCP1650/51/52/53.
5.1.3
SEPIC CONVERTER
with the previous boost-converter applications, the
APPLICATIONS
In many applications, the input voltage can vary above
and below the regulated output voltage. A standard
boost converter cannot be used when the output volt-
age is below the input voltage. In this case, the
MCP1650/51/52/53 can be used as a SEPIC controller.
A SEPIC requires 2 inductors or a single coupled
SEPIC converter can be used in either a bootstrap or
non-bootstrap configuration. The SEPIC converter can
be a very popular topology for driving high-power
LEDs. For many LEDs, the forward voltage drop is
approximately 3.6V, which is between the maximum
and minimum voltage range of a single-cell Li-Ion
battery, as well as 3 alkaline or nickel metal batteries.
inductor, in addition to an AC coupling capacitor. As
Li-Ion Input to 3.6V 3W LED Driver (SEPIC Converter)
3.3 μH
4.7 μF
Schottky Diode
I OUT = 1A
off
2
5
Input
Voltage
2.8V to 4.2V
C IN
47 μF
10 ?
0.1 μF
o n
V IN
8
GND
SHDN
NC 6
MCP1651
3
1
4
7
CS
EXT
FB
PG
N-Channel
MOSFET
3.3 μH
2.49 k ?
C OUT
47 μF
Ceramic
0.1 ?
Dimming Capability
Power Good Output
1 k ?
3W
LED
0.2 ?
FIGURE 5-3:
DS21876A-page 16
SEPIC Converter Application Circuit MCP1650/51/52/53.
? 2004 Microchip Technology Inc.
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